User interface for a portion of a display screen



FIG. 1 is a front view of a graphical user interface for a portion of a display screen showing my/our new design; and,

FIG. 2 is an enlarged view of the claimed region of FIG. 1.

The broken line showing immediately adjacent to the claimed region forms no part of the claimed design. The broken line showing of the display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a user interface for a portion of a display screen, as shown and described. 